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Your description is really vague: what kind of work did this 'gun doc' do? Have you tried taking it apart yourself?
Other than that, this sounds like either a dirty barrel or ripped hop up rubber. Remove the barrel and hop up rubber, check the barrel for dirt and scratches, check the hop up rubber for rips, wear and good seal. Clean the barrel with a small square of cloth and a cleaning rod, and if you find any problems with the rubber then just buy a replacement.
Side note: continuing to fire after a jam to dislodge a stuck BB is a TERRIBLE idea and might ruin your barrel's inner surface finish.
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Airsoft is where expensive things go to die.
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